A vandal riding a CitiBike carrying a LGBTQ rainbow flag is being sought for vandalizing three Queens churches in a 20-minute span , spray-painting graffiti calling them “anti-gay cults,” police said Wednesday.

Cops released surveillance footage of the suspect , who wore sunglasses and a rainbow handkerchief that covered his nose and mouth, and asked the public’s help identifying him and tracking him down.

The vandal hit the three churches, which are all within a few blocks of each other in Far Rockaway, in quick succession beginning at 1:40 a.m. on Oct. 5, cops said.

The spree began at the Refuge Church of Christ on Mott Ave. near Beach 19th St., where he wrote “Anti-gay cult” in black spray-paint on the sidewalk outside the house of worship, cops said.

He then rolled on to the Ci

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